I know the idea of a screw-on focal length reducer/expander is blasphemy to many, some of them do work well, and not for the specific cameras they were intended to be used on. I've got a Sony 1.5x unit I picked up for about $20 in a discount bin and it works well on m4/3rds zoom I have, adding just a little edge blurring. It's more compact than carrying a longer prime or longer zoom. Having said that, some of them are terrible, they are unsharp, add colour error and vignette like crazy.
Agreed Rich, its very odd what does and doesn't work. I tried 3 different Raynox ones, which "should" of worked well as they were highly reviewed and cost about $150 each, "top of the line" so to speak and yet horrible results so you can't really judge these things by price.
I still need to try to find a tele extender that could work (or at least work "bad" with a unique way of rendering that I like lol) and I'd be pretty set.
New model sounds cool, but seems they are offering a 28 and 50mm equiv's for it, at least off the bat. I really don't enjoy those focal lengths and really like 35mm.
I'd like a 21/35/90mm 3 lens set in a perfect world. Not sure if I'd want to spend $1500+ on a new body and then whatever the lenses cost just to have 28 and 50mm. Could very well end up spending thousands of dollars and enjoying my x100 more still, with its issues, just on account of the focal length I "see" better with
Cheers